Nortel Networks Circuit Card 311 - Manual (Page 267)

Physical description 267
Table 111
LEI card LED operation
LED Operation
Status Line card
Red alarm E1 near end
Yellow alarm E1 far end
Maint Maintenance
The STATUS LED indicates if the LEI has successfully passed its self test,
and therefore, if it is functional. When the card is installed, this LED remains
lit for two to five seconds as the self-test runs. If the self-test completes
successfully, the LED flashes three times and remains lit. When the card
is configured and enabled in software, the LED goes out. If the LED
continually flashes or remains weakly lit, replace the card.
The STATUS LED indicates the enabled/disabled status of both card slots of
the LEI simultaneously. To properly enable the card, both the motherboard
and the daughterboard slots must be enabled. The STATUS LED turns
off as soon as either one of the LEI slots are enabled. No LED operation
is observed when the second card slot is enabled. To properly disable the
card, both card slots must be disabled. The LED does not turn on until
both card slots are disabled.
The RED ALARM LED indicates if the LEI has detected an alarm condition
from the E1 link. Alarm conditions can include such conditions as not
receiving a signal, the signal has exceeded bit error thresholds or frame slip
thresholds. See
"Man-Machine E1 maintenance interface software" (page
292) for information on E1 link maintenance.
If one of these alarm conditions is detected, this LED turns on. Yellow alarm
indication is sent to the far end as long as the near end remains in a red
alarm condition. Depending on how the Man Machine Interface (MMI) is
configured, this LED remains lit until one of the following actions occur:
• If the "Self-Clearing" function is enabled in the MMI, the LED clears
the alarm when the alarm condition is no longer detected. This is the
factory default configuration.
• If the "Self-Clearing" function has not been enabled or it has been
subsequently disabled in the MMI, the LED alarm indication stays lit
until the command "Clear Alarm" is typed in the MMI, even though the
carrier automatically returned to service when the alarm condition was
no longer detected.
The YELLOW ALARM LED indicates that the LEI has detected a
yellow alarm signal from the terminal equipment side of the E1 link.
See
"Man-Machine E1 maintenance interface software" (page 292) for
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.